To Prevent The Windshield From Fogging Up - Toyota Tacoma 2013 Owner's Manual

3-1. Using the air conditioning system and defogger
CAUTION

To prevent the windshield from fogging up

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Do not set the air outlet selection dial to
extremely humid weather. The difference between the temperature of the
outside air and that of the windshield can cause the outer surface of the
windshield to fog up, blocking your vision.
NOTICE
To prevent battery discharge
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Do not leave the air conditioning system on longer than necessary when the
engine is stopped.
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during cool air operation in